19 Jun 03 1

Lamberston Removal and F0 Straight Section Vacuum Upgrade

Mike McGee

FNAL

19 Jun 03 2

Staging Magnet Mover

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19 Jun 03 3

Lambertson #2 Removal with Magnet Mover

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19 Jun 03 4

F0 Vacuum Upgrade

• Replacement of A150, P150, P1, Tev US and Tev DS spool sections

• 3” and 4” diameter Electro-polished, H2 degassed beam tube

• Addition of Differential Pumping to limit conventional beamline gas loads

• Addition of TSP in Tevatron Spool sections (must maintain 1e-9 Torr to be effective)

19 Jun 03 5

Differential Pumping

• Gas load of A150, P150 and P1 lines are greater than Lamberston gas load (must also consider MI-60 liner test results)

• Q(A150) = 5.76e-6 Torr*liter/(sec*cm^2)• Q(P150) = 3.96e-6 Torr*liter/(sec*cm^2)• Q(P1) = 4.68e-6 Torr*liter/(sec*cm^2)• Q(Lam) = 5.28e-6 Torr*liter/(sec*cm^2)• Factor of 2 improvement• Q(Lam w/ liner) = ?

19 Jun 03 6

TSP Design

TSP (Titanium Sublimation Pump)cf 0.0254 m/in

Conductance Under molecular flow L > 10*IDID 0.097384 m Tube inner diameter (4" OD tee)T 300 K Temperature of moleculesL 0.0635 m Length of tube section (along tee)M 2.02 gm/mole Molecular weight of H2Ci 0.675295 liters/sec Aperture conductance per cm^2 for gas species "i"Alphai --- Sticking coefficient for gas species "i"Ac 952.7 cm^2 Equivalent surface area

Surface Pump SpeedSpecies "i"H2 CH4 CO O2 H2O CO2Alpham 0.05 0.0009 0.85 0.95 0 0Alphai 0.01 0 -0.15 -0.15 0.5 0.5Ac 952.7 952.7 952.7 952.7 952.7 952.7 cm^2C 0.675295 0.675295 0.675295 0.675295 0.675295 0.675295 liters/sec

Ss 6.433478 0.579013 96.50216 96.50216 321.6739 321.6739 liters/sec

TSP will remove CO, H2O, but not CH4. Ti needs to cover only 5 monolayers. Must use Varian Starcell in conjunction w/ TSP to pump noble gases

8" d iameter tube

4" d iameter tube tee

TSP C artridge

Var ian Ti Filaments

19 Jun 03 7

A150 Line Vacuum Upgrade

300 l/s

Multiwire

300 l/s

2.5 m

Current F0 Lambertson (DS) A-150 Line

F0 Lambertson (DS) A-150 Line

300 l/s

20 l/s

7.595 m

Multiwire

4.098 m

19 Jun 03 8

P150 Line Vacuum Upgrade4.839 m

500 l/s

1.25 m

Current F0 Lambertson (US) P-150 Line

500 l/s

1.25 m

500 l/s

F0 Lambertson (US) P-150 Line

19 Jun 03 9

P1 Line Vacuum Upgrade

2.5 m

F0 Lambertson (DS) P1 Lin e 300 l/s 300 l/s

Current F0 Lambertson (DS) P1 Line

7.849 m

300 l/s

2.5 m

Multiwire

19 Jun 03 10

Tevatron Us and DS Vacuum Upgrade

25 l/s

25 l/s

F0 Lambertson (US) Tev

F0 Lambertson DS Tev

7.425 m

5.959 m

25 l/s

19 Jun 03 11

Virtual Leak of Liner

• Lamination cracks should be < 1% of entire exposed surface area (Dave Harding)

• Perforated area 2.5% of entire liner surface area (Alex Chen)

• MI-60 Testing

19 Jun 03 12

CuBe Liner Vacuum Prep

• Cleaning Distilled water heated to 110 F and ultrasonic bath

Distilled water and Citranox (1%) ultrasonic bath

(PH 8-9)

Dry with alcohol and nitrogen

• Pre-bake• Vacuum testing at MI-60 (RGA)• In stu bake with entire F0 vacuum upgrade

19 Jun 03 13

Future Considerations

• Use of 3” diameter beam tube contingent on aperture studies

• Complete vacuum system review mid July after liner vacuum testing

• Consider Multiwire gas load on vacuum system